[Solved] The RAST blood tests are primarily used to determine food allergies. Natural Selection: A process in evolutionary biology where organisms better adapted to their environment tend to survive and produce more offspring, driving evolutionary change. Erotic Plasticity: The degree to which an individual's sex drive can be changed by cultural, social, and situational factors. Reproductive Potential: The biological capability of an individual or species to produce offspring, contributing to the genetic diversity of a population. Erotic Plasticity: The degree to which an individual's sex drive can be changed by social, environmental, and situational factors.